There are more than 43 million family caregivers in the United States. In studies of family caregivers and receivers, evidence suggests that family caregiver-receiver mutuality is linked to health. Lack of a clear definition of family caregiver-receiver mutuality is an obstacle that prevents scientific progress and effective operationalization of the concept. To address this issue, the authors applied Walker and Avant's method for concept analysis and clarified the concept of family caregiver-receiver mutuality. A standardized definition of caregiver-receiver mutuality is presented along with antecedents, consequences, defining attributes, empirical referents, and case illustrations.